def func1():
    print("你们好！")
print(func1())

你们好！

def func2():
    for i in range(10):
        print(i)
print(func2())

0
1
2
3
4
5
6
7
8
9

def add(a,b,c):
    return a+b+c
print(add(3,4,5))

12